How To Identify Problematic Part; Initial Check Items - Konica Minolta bizhub C350 Service Manual

Image quality problem
4.2

How to identify problematic part

• This chapter is divided into two parts: "Initial Check Items" and "Troubleshooting Proce-
dure by a Particular Image Quality Problem."
• When an image quality problem occurs, first go through the "Initial Check Items" and, if
the cause is yet to be identified, go to "Troubleshooting Procedure by a Particular Image
Quality Problem."
4.2.1

Initial Check Items

A. Initial Check Items 1
• Check first to see if image data is properly transmitted between Scanner and memory,
and between memory and printer.
Enter the Tech. Rep. Mode, select "Machine Adjust" → "Memory/
Hard Disk Adjust" → "Memory Bus Check," and select and carry
out "IR→Memory" and "Memory→PRT" checks.
B. Initial Check Items 2
• Let the copier produce a test print and determine whether the image problem is attribut-
able to the Scanner or printer system.
Scanner system
Printer system
• Evaluation Procedure
Image
Problem
From "Tech. Rep. Mode," select "Test Print" →
"Halftone Pattern" → "SINGLE" → "HYPER"
Lines,
→ "Gradation" → "C→M→Y→Bk" → "Density
bands
64," and produce a test print. Is image prob-
lem evident?
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bizhub C350 Field Service Ver2.0 Sep. 2004
Action
Document Scan
CCD Sensor Board PWB-A
MFP Control Board
PWB-MFP
LED Drive Board
PWB-LED
Action
Result
OK Initial Check Items 2
☞
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NG
(action as instructed)
Image Processing Board
PWB-C
I/F Cable
Test Print
4036fs4019c0
Result Cause
YES Printer Initial Check Items 3
☞
NO Scanner
Next Step
Next Step
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